Fig. 5.

Diversity in characteristic components of the cyanobacterial CCM living in three different pH environments; freshwater (pH ~ 7), marine (pH ~ 8.2), and alkaline (pH > 8.5). The scheme is based on the literature data and is depicted for β-cyanobacteria. The species that were used to derive the groups are shown on the figure. CCM components of freshwater and marine cyanobacteria are adapted from [3]. CCM components of high alkaliphilic cyanobacterial type were identified in this study. + and ± indicate that the particular component is ‘always present’ and ‘sometimes present’, respectively. Designation: NDH-1₄, low-affinity CO₂ uptake system NDH-1₄ complex; NDH-1₃, low CO₂-inducible high-affinity CO₂ uptake system NDH-1₃ complex; BCT1, ATP-binding cassette (ABC)-type high-affinity HCO₃⁻ transporter; SbtA, high-affinity sodium-dependent HCO₃⁻ symporter; BicA, SulP-type low-affinity sodium dependent HCO₃⁻ transporter; CA, carbonic anhydrase; Rubisco, ribulose-1,5-bisphosphate carboxylase/oxygenase.